Shuttle transmission



Jan. 14, 1930. J. R. BLACK 1,743,344

SHUTTLE TRANSMI S S I ON Filed March 27, 1926 2 Sheets-Sheet 1 INVENTOR ATTORNEY Jan. 14; 1-930. J. R. BLACK 1,743,344

SHUTTLE TRANSMISSION Filed March 27, 1926 2 Sheets-Sheet 2 l i2? 2,329 30 31 a2 33 INVENTOR i v JVM Q A v ATTORNEY Patented Jan. 14, 1930 JQHN RAIIDALL- BLACK, or TOULQN; ILLINOIS,

SHUTTLE TRANSMISSION Applicationfiled March-27, I926. Seri-aLNm eases.

This invention relates to power transmission devices in which a differentiation in power may beselectively attained between a dri viiig shaft and an alined driven shaft.

@ne of the ebjects of the invention is to provide a novel, eflicient and substantially silent mechanism whereby differences in speedrlationiay be attained or the same speed maintained, between apair of registering shaiits, eliniiiiating all recourse to belt shift-s, change gearsand like devices. 7 1

A fhrtlierfeature is in theprovisionof an essentially simple, compact mechanism capable of-bei'ng conveniently applied toexisthag-structures without-material change there- Anotheraim-is to produce aspeed: changing device that is easily and instantly controlled by a siiigle lever in attaining the desired results, the device shown being particularly designed with reference to self propelled vehicles but isby no means limited to such use.

These several objects are accomplished by the novel construction, combination and arrangement ofpartshereinafter describedand shown in the drawings forminga component hereof and which Fig; 1 is a transverse sectional view -of'an embodiment of a speecl'changingolevice,'made in accordance with the invention, the section being; taken on line 1---l of FigureQ, certain partsbeiiig omitted forthepurpose-of' clarity.

Fig, 2 is a fragmentary longitudinal sectional view taken substantially on line- 2-2 of Figure 1'. V

In these illustrations the numeral rdesignatesa driving shaft propelled by any power source and operative in any preferred position and adjacent the end of the shaft, in

register therewith, isa driven shaft 1I,sho.wn as of the same diameter and. connectedv with the: elements to which power is to. betransmitted,

The drivingsha-iit 10 has its endsecured within a flange lflby'a key or pin13 as shown, the flangebeing fixed rigidly on the outer face of a soliddisc 14 into: which enters the end of thedrixlen shaft 11 to revolve therein,

an antifriction bearing 15 being PIOVldBdi EOI that purpose; I l

Mounted on the driven: shaft 11.. adjacent the disc 1 LT and? positively driven by a. key 16; isa spurwheel 17 having a series'offluni- 5.5 formly spaced, symmetrical, substantially triangular lobes 18,. their curved side edges converging into points; 7 V

Adjacent the spur wheel is circular plate 19' havinga shorthub on. its outer faceaznd secured to the outer sideof: the; plate. is & flange-having a hub 20 containing; a; recess 21 in which is: a heliloally coiled compressi n spring: 223,, its: inner end abuttingthe: plate L9and itsvouter end; seatingagainst a, sleeve 15,5 23, the inner-flanged end of? which; is: held within the recess through which he. main portion ofthe sleeve extendsthe pla e and sleeve being free upon, the shaft 11- Gircumjacent; the-spur-wheel 157i is a flam 7 like; element, or" shuttle 24:, the. same being positionedbetween thesfiy wheel 154., andzpl 19; The flattened parallel; sideedges of. he

shuttle; operate.v between a pair. of; opposed, straight roller or other suitable bearings 25 attached to the fly wheel 14- to reduce; friction when the shuttle is actuated as later described.

Mounted in; parallel? t the shafts are two rigidly supported bars 26 on which are slidablymounted. a. series of fiat plates 27, 28, 29, so 30, 31, 32 and 33 tied firmly together by bolts 34, these bolts also securing to the outer plate 27 a bail l-ikeelement '35, outwardly bowed and provided with a hub 36 surrounding; the driven shaft lllbut free, and clear of'i't'.

The hub 36L has an annular groove to receive rolls 37 carried on the arms 38 of a forked shifting lever, not shown, by which the several plates are shifted. as aunitqon. the bars 26 whena change in; speed of the driven shaft 11 is desired.

Returning to the shuttle- 24, it will be seen that the sameh-as an Qpening39 into which extend two teeth. 40.. and 411, directed towards the axis of the shafts and adapted to beeperativelyengaged by the lobes 1'8 alternately, the; lobesbeing preferably of some oddv numbers, eleven being shown.

From the foregoing it will be understood 1 ing quiescent.

On the outer, arcuate portions of the shuttle, directly opposite the teeth, are rounded lugs or knobs 42 and 43, the same being 7 engageable progressively with undulations is used formed in the inner peripheries of the plates 27 to 33, in accordance with whichever of the plates is in register with the spur wheel and shuttle.

The number of undulations in each of these plates varies considerably, for instance, as follows :Plate 27 is preferably bored circularly; plate 28 may have three cavities and corresponding convexities; plate 29 has seven,

plate 30 has nine, and plate 31 representing neutral is provided with eleven or if desired this plate may be eliminated. The plates 32 and 33, used inreverse only, are providedwith nine and seven undulations respectivelyr a It will beunderstood that the speed ratio of the shafts is dependent upon the relative number of points on the spur wheel '17 and the number of undulations in the plate in register with it it will also be evident that in order to allow the shuttle 24, which has op posite symmetric ends, to move reciprocatively, all of the several plates will preferably have an odd, uneven number of undulations.

To obtain the ratio R of torque transmitted, knowing the'number of lobes. or spur wheel points P in the spur wheel 17 and number of undulations U in a plate, this formula or, a concrete example applied to plate 30,

When the plate 31 of the series or the space shown as occupied by it is moved to register with the spur wheel 17, no motion will be transmitted from the shaft 10, as the shuttle oscillates idly with the spur wheel and the spur wheel is not affected.

Upon shifting the series to bring the plate 28, having three undulations, into register with the spur wheel, a proportionate degree of torque will be transmitted to the driven shaft in the ratio of approximately 1 to 1.37 similarly the next plate 29, having seven undulations will transmit a torque ratio of 1 to 2.7 5 at each revolution of the driving shaft, and the plate 30, as has been shown, having nine undulations, will transmit a torque ratio of 1 to 5.5 of the driving shaft, while the plate 27 having no teeth will obviously transmit the same speed to the driven shaft as is attained by the driving shaft, since the shuttle will cease to oscillate.

When the outer plate 27 is caused to register withthe spur wheel 17, the hub 36 of the bail will contact with the sleeve 23, compressing the spring 22, moving a pair of arms 44, fixed to the sleeve and carrying conically pointed detents 45, towards the fly wheel 14, the detents engaging in openings 46 formed in the side elements of the shuttle 24, looking it in a central position against length wise motion but permitting it to rotate within the opening in the plate 27, together with :the spur wheel 17.

When the actuating lever shifts the series of plates on the fixed bars 26, in either di rection, the lugs or knobs 42 and 43 have two opportunities to pass between the adjacent opposed undulations of the plates at each full revolution of the driving shaft, thus permitting of rapid change in speed.

.In passing from plate 28 to plate 27, (or the reverse) these. opportunities occur only at the intersections of thecontours of these two plates; the opportunities numbering six toeach revolution of the fly wheel.

,The foregoing disclosuref is to be regarded as descriptive and'illustrative only, and not asrestrictive or limitative of the invention, of which obviously an embodiment may be constructed including many modifications without departing from the general scope herein indicated and denoted in the appended claims. .3 V I Having thus described my invention, what I claim asnew and desire to secure by Letters Patent, is:' I

1. In a shuttle transmission device, a driving shaft; a shuttle reciprocally mounted thereon and adapted to rotate therewith, and provided with outwardly extending lugs and inwardly extending teeth; a driven shaft; a spur wheel mounted thereon and provided with a plurality of lobes adapted to engage.

with the teeth of the said shuttle; and means for changing the speed ratio between the driving and driven shafts comprising plate supports, a plurality of plates slidably mounted on the said supports, a series of undulations on the peripheries of said plates, and means adapted to move tliesaid' plates into and out of operative engagement with the lugs on the shuttle. V

2. In a shuttle transmission device, a driving shaft; a shuttle reciprocally mounted thereon and adapted to rotate therewith, and provided with outwardly extending lugs and inwardly extending teeth; a driven shaft; a spur wheel mounted thereon and provided with a plurality of lobes adapted to engage with the teeth of the said shuttle; and means to selectively impart to the said driven shaft a predetermined percentage of torque from the driving shaft comprising plate supports, a plurality of plates slidably mounted on the said supports, a series of undulations on the peripheries of said plates, and means adapted to move the said plates into and out of operative engagement with the lugs on the shuttle.

3. In a shuttle transmission device, a drivm ing shaft; a shuttle reciprocally mounted thereon and adapted to rotate therewith, and provided with outwardly extending lugs V and inwardly extending teeth; a driven shaft; a spunwheel mounted thereon and 15 provided with a plurality of lobes adapted to engage with the teeth of the said shuttle; and means for changing the speed ratio between the driving and driven shafts comprising plate supports, a plurality of plates slidably 20 mounted on the said supports and provided with undulations on their peripheries; and means for shifting the said plates on their supports to selectively move the said undulations into and out of operative engagement 25 with the lugs on the shuttle.

at. In a shuttle transmission device, a driving shaft; a shuttle reciprocally mounted thereon and adapted to rotate therewith, and provided with outwardly extending lugs and inwardly extending teeth; a driven shaft; a spur wheel mounted thereon and provided with a plurality of lobes adapted, to engage with the teeth of the said shuttle; and means to selectively impart to the said driven shaft a predetermined percentage of torque from the driving shaft comprising plate supports, a plurality of plates slidably mounted on the said supports and provided with undulations on their peripheries; and means for shifting the said plates on their supports to selectively move the said undulations into and out of operative engagement with the lugs on the shuttle.

5. In a shuttle transmission device, a driv- 5 ing shaft; a shuttle reciprocally mounted thereon and adapted to rotate therewith, and provided with outwardly extending lugs and inwardly extending teeth; a disk wheel secured to said driving shaft; a driven shaft; a spur wheel mounted thereon and provided with a plurality of lobes adapted to engage with the teeth of the said shuttle; and means to selectively impartto the said driven shaft a predetermined percentage of torque from :3 the driving shaft comprising plate supports, a plurality of plates slidably mounted on the said supports and provided with undulations on their inner peripheries adapted upon rotation of the disk wheel on the driving c shaft toengage with the lugs on the said shuttle; and means for shifting the said plates on their supports to selectively move the said undulations into and out of operative engagement with the lugs on the shuttle.

5 JOHN RANDALL BLACK. 

